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# AccessibilityService.MagnificationController.OnMagnificationChangedListener

`public static interface AccessibilityService.MagnificationController.OnMagnificationChangedListener`
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android.accessibilityservice.AccessibilityService.MagnificationController.OnMagnificationChangedListener

Listener for changes in the state of magnification.

## Summary

### Public methods
`abstract void` | `onMagnificationChanged(AccessibilityService.MagnificationController controller, Region region, float scale, float centerX, float centerY)` Called when the magnified region, scale, or center changes.

## Public methods

### onMagnificationChanged

    public abstract void onMagnificationChanged (AccessibilityService.MagnificationController controller,
                    Region region,
                    float scale,
                    float centerX,
                    float centerY)

Called when the magnified region, scale, or center changes.

Parameters
`controller` | `AccessibilityService.MagnificationController`: the magnification controller This value cannot be `null`.
`region` | `Region`: the magnification region This value cannot be `null`.
`scale` | `float`: the new scale
`centerX` | `float`: the new X coordinate, in unscaled coordinates, around which magnification is focused
`centerY` | `float`: the new Y coordinate, in unscaled coordinates, around which magnification is focused

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